Error in Netbeans: "Cannot find an HtmlParser implementation for HTML5"

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http://askubuntu.com – When I open a file in Netbeans, I get a Please wait... on the first line of in the editor window. I also get an exception icon at the bottom of the screen which says: A org.netbeans.modules.parsing.spi.ParseException exception has occurred. However, the system should continue working without further problems. Click Show Details for the stack trace. If I click on "show more details", I get this: java.lang.IllegalStateException: Cannot find an HtmlParser implementation for HTML5 at org.netbeans.editor.ext.html.parser.api.SyntaxAnalyzerResult.findParser(Unknown Source) at org.netbean (HowTos)